ARP 2600 - High-Pass Filter Creation via Signal Inversion

88
5.
Inverting any
signal
and combining
h with a filtered version
of itself
will result
in cancellation
of
the
unfiltered
components of
the signal.
In
other words, this
is
how
to
turn
a low-pass
into
a high-pass
filter.
Level settings are quite critical-tune
them
to
a
null
at the VCA output
while the
VCF initial
gain
is
all the
way
up and
Q
is at
minimum.
Use
the Noise
Generator
to
begin with,
and patch
it to one
of
the unattenuated
inverter inputs.